Stage light flare effect
All right, I have been working all day figuring this thing out with over-complicated shenanigans, but the answer was quite simple:


As you can see first I had to separate the globe from the actual stage light cause then the whole gray part started to shine as well.

Next I tried to fix up the original nodes, but it got real messy real fast so I decided to make two frames:


Original
Edited


The Edited one is shown on top. Also you used ID Masks without defining which object you gave the ID to in the "Object" menu.

This produced the final result below. If you want you can modify the streaks to your wish.

NOTE: I know it isn't exactly realistic, but that is the closest I can get.

BTW the rendered result is 50% of the actual resolution cause it would take me hours to render the whole image. Also great work on detail.